Virtuoso provides access to heterogeneous data sources through industry
standard data access interfaces such as ODBC, JDBC, OLE DB, .NET Data
Providers, XML, XPath, and XQuery. It also integrates transparently with
runtime environments for distributed computing such as Microsoft .NET, Mono,
and J2EE, enabling the creation and hosting of WSDL-compliant XML Web Services,
Stored Procedures, Functions, Triggers, and User Defined Types that are
written in Java or any .NET bound language.

Virtuoso 3.0 is currently available in public beta form for the following
platforms: Windows(R), Mac(R) OS X, Linux(R), and UNIX(R). It will be
commercially available during the first week of March 2003.